Sr₂Mn₃As₂O₂

Unit cell

Lattice constants

a = 4.146 Å, b = 4.146 Å, c = 18.859 Å; α = 90.00°, β = 90.00°, γ = 90.00°

Cell volume

324.2 ų

Atoms in the conventional cell

18 (Mn 6, O 4, As 4, Sr 4)

Formula units Z

2

Pearson symbol

tI18 — tetragonal, body-centred lattice, 18 atoms per conventional cell

Symmetry operations

32 per cell

Crystallographic sites

The multiplicity and the Wyckoff letter say how many copies of the site the group makes in one cell and on which kind of symmetry element the site sits; the 18 atoms drawn above are these sites multiplied by all 32 operations. Press Wyckoff under Colour to see the sites, and tick a symmetry element on the left to see which atoms lie on it.

How to read the label

A2B3C2D2_tI18_139_e_ad_c_e-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol tI18, then the space-group number 139, then the Wyckoff letters occupied by each element in turn (Mn: 2a; O: 4c; Mn: 4d; As: 4e; Sr: 4e). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

Ba₂Mn₃As₂O₂, Ba₂Mn₃P₂O₂, Ba₂Mn₃Sb₂O₂, La₂O₃Fe₂S₂, La₂O₃Fe₂Se₂, Sr₂(Mn₂Cu)As₂O₂, Sr₂(MnZn₂)As₂O₂, Sr₂Mn₃Bi₂O₂, Sr₂Mn₃Sb₂O₂ <!--beginning with an

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A2B3C2D2_tI18_139_e_ad_c_e-001 (M. J. Mehl et al., Comput. Mater. Sci. 136, S1 (2017); D. Hicks et al., ibid. 161, S1 (2019) and 199, 110450 (2021); S. Eckert et al., ibid. 240, 112988 (2024)). Symmetry elements, Wyckoff assignment and the diagram are computed on this page from the group operations.